Spellcasting Requirements

If a spell is listed with material components, then then a component pouch is required to cast the spell.
However, a component pouch may be substituted for a casting focus (rods, wands, crystals, staffs, holy symbols, etc.).
If a spell does not require a material component, neither a component pouch or focus are required.

If a spell is listed with a vocal component, the caster must have the ability to speak. Being silenced or otherwise gagged would prevent the spell from being cast.

If a spell is listed with somatic components, the user must be able to move their arm(s). Being bound, entangled, or otherwise paralyzed would prevent the spell from being cast.

Spellcasting Requirements

The Sword Coast Irewolf